Iron–Cobalt Phosphomolybdate with High Electrocatalytic Activity for Oxygen Evolution Reaction

Abstract

Iron-cobalt phosphomolybdate (FeCoPM ) nanoparticles, which are highly efficient catalytic materials for the oxygen evolution reaction (OER), were fabricated through a coprecipitation route. Compared with iron-cobalt hydroxide and state-of-the-art RuO electrocatalysts, the as-prepared FeCoPM sample exhibited robust OER catalytic activity with a low overpotential of 258 mV at a current density of 10 mA cm and a small Tafel slope of 33 mV dec . Moreover, the as-synthesized sample presented preferable stability and after 10 h at 1.52 V the current density degraded by merely 8.3 %. This is ascribed to the high electrochemical stability and small porous structure of FeCoPM , which provide effective electron transmission and improve the catalytic performance for OER in alkaline media.

Phosphate‐Based Electrocatalysts for Water Splitting: Recent Progress

“…New techniques are carried out to provide more synthetic methods for catalysts such as in situ surface derivation, electrochemical topotactic conversion or oxidative polarization, solidstate method, sol-gel method, solution combustion synthesis (SCS) and chemical vapor deposition (CVD) and microwaveassisted method. [73,91] For example, CCH@CoÀ Pi NA/Ti was obtained via in situ electrochemical surface derivation used Co (CO 3 ) 0.5 (OH) · 0.11H 2 O nanoarray on Ti mesh (CCH NA/Ti) as the precursor. [95] Single-crystalline electrocatalyst was successfully fabricated through a solid-state method, which is superior in OER with ultrathin structure.…”

“…It is still a challenge to explore a facile and efficient way in the manufacture of catalyst with superior water oxidation performance. New techniques are carried out to provide more synthetic methods for catalysts such as in situ surface derivation, electrochemical topotactic conversion or oxidative polarization, solid‐state method, sol‐gel method, solution combustion synthesis (SCS) and chemical vapor deposition (CVD) and microwave‐assisted method ,. For example, CCH@Co−Pi NA/Ti was obtained via in situ electrochemical surface derivation used Co(CO 3 ) 0.5 (OH) ⋅ 0.11H 2 O nanoarray on Ti mesh (CCH NA/Ti) as the precursor .…”

“…Precipitation is a facile and low-cost way for electrocatalysts fabrication, such as Cu 2 MoS 4 [90] and FeCoPM 12 . [91] Precipitation is a common syntheses method of phosphate-based electrocatalysts which operating in the mixture of phosphate aqueous solution and metal salt solution such as cobalt nitrate, iron nitrate, nickel chloride and potassium permanganate at ambient temperature. Since Kanan and Noreca reported that an amorphous cobalt phosphate catalyst can be formed in neutral phosphate buffer solution containing Co 2 + .…”

Adsorption removal of methyl violet from aqueous solution by chromium phosphovanadate

“…The phosphovanadate (PV) was prepared by a coprecipitation method. 26,28 Typically, ammonium metavanadate and sodium dihydrogen phosphate dihydrate with a molar rate of 4:1 were dissolved in 10-ml ultrapure water at 60 C and kept stirring for 15 min to obtain the precursor solution. At the same, 0.08-g chromic nitrate nonahydrate was dispersed in 2-ml ultrapure water and then injected into the precursor solution, stirring for 15 min.…”

“…[22][23][24] POMs with abundant and stable metallo-oxo units have been widely applied in various fields including photocatalytic degradation, 22 adsorption, 23,24 oxidative desulfurization, 25 and electrocatalysts. 26 As reported in the literature, POMs, acted as discrete polyanionic molecules, are favorable adsorbents to remove organic dyes from wastewaters. 27 Inspired by the structure character of POMs, we speculated that a metallo-oxo complex with high negative charges, chromium phosphovanadate (Cr-PV), which would have good potential for the removal of MV from aqueous solutions.…”